Brush-holder.



PATENTED APR. l 6, 1907. J. P. MALLETT & T. E. DRUHAN. BRUSH HOLDER. APPLIOATION FILED MAY 10, 1901.

and the other end maKes contact with the en- UNITED srArns PATENT OFFIOE.

OHN P. MALLETT AND, THOMAS E. 'DROHAN, OF MADISON, WISCONSIN SIGNORS TO NORTHERN ELECTRICAL MANUFACTURING COMPANY, OF MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

BRUSH-HOLDER.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed ita ie, 1901. are in. 59,557.

To all whom it may concern:

Be it known that we, JonN P. MALLETT and THOMAS E. DROHAN, citizens of the United States, both residing at Madison, in

the county of Dane and State of Wisconsin,

have invented a'certa'in new and useful Improvement in Brush-Holders, of which the following is a specification.

Our invention relates to brush-holders, and

has for its object to provide a new and improved brush-holder to be used in connection with dynamos, motors,'and other electrical appliances.

Our invention is illustrated in the accom-- panying drawings, wherein Figure 1 is a side new of a brush embodying our invention. Fig. 2 is a vertical longitudinal section through the brush shown in Fig. 1. Flgtfi is a plan view showing one section of the brush.

Like letters refer to lilie'p'arts throughout any desired manner, and, as herein-shown,

the connection is made by means of a screw C, which passes through the brush and enters the frame. ed upon the rod or stud D, which is supported in any desired'manner, so as to hold the brush in proper relation to the commutator E.' An engaging part or member F is located between the arms of the frame A. This engagingpart is tightly clamped in any desired manner to the stud I), sov as to make good electrical contact therewith, and is provided The frame A is movably mountwith a projecting part extending between the sides of the frame A toward the brush B. As herein shown, the end of the engaging part is split, and it is clamped in position by means 3 of the thumb-screw G. A pressureregulat ingspring II is mounted in the frame A and has one end rigidly connected with the frame in {any desired-manner, as by means of the screw I. This spring is bentback upon itself,

gaging part F at the point J.

herein shown, is U-shaped, and the pressure of the brush or other contact on the opposed contact may be regulated by varying the position. of the stud D or of the engaging part F. The engaging part F is electrically connected with the brush B and the frame A by means of the flexible connection L, which may be a spring or other flexible device, as desired. It will thus be seen that by this construction a brushv is provided which is elastically forced against the commutator or other opposed part, in which. the electrical connections are positive, there being no sliding contacts. The construction is such that the major portion of the spring is locatedbetween the arms of the frame. By reason of the. roXimity of the said arms to the spring the atter is practically inclosed and protected by the frame. It will also be seen that we have here a construction for efl'ectively securing the tension of the brush on the commutatorand for'adjust-ing said tension for carrying ed the current from the brush to the terminals and for also preventinginjury to the commutator by contact with'the frame. The construction disclosed permits the use of a relatively long spring, which-is so disposed as. to take up but little room.

The current passes from the brush to the flexible connection lJ, thence to the engaging part F, and thence to the stud I), all of the contacts between the various parts being fixed or stationary, so that an eliicientelcctrical contact is obtained. The brush holder is provided with a protecting device for the commutator, arranged so that the frame of the holder cannot come in contact with the commutator when the brush becomes worn. As herein illustrated, this re sult is obtained by fastening an insulating \piece M to the lower part of the frame. When the brush becomes worn a predetm'mined amount, this insulatiiigpiece rests on the l commutator and prevents the frame of the holder from cutting or otherwise injuring it. The frame A may be made of any desired In ateria'l, and to secure a light brush-holder we prefer to construct it of aluminium.

In Fig. 3 we have shown one section of the The spring brush, and it will be understood that in most preferably passes around the cross-piece or instances two or more of these sections are holding part K, which prevents the loop end from becoming displaced. This spring, as

' used side byside and mounted upon the same stud.

We have described in detail' a particular E construction embodying our invention; but f it is of course evident that the parts may be varied in many particulars without departing from the spirit of our invention. We therefore do not limit ourselves to the construction shown.

We claim 1. A brush-holder, comprising a frame, a brush rigidly connected with said frame, an engaging part associated with the frame and rigidly connected with a support, a spring bent back upon itself and interposed between the engagingpart and the frame, so that the brush will be""elastically forced against its opposed surface when the engaging device is properly adjusted, and a flexible connection between the brush and the engaging device and having a stationary contact with each.

2. A brushholder, comprising a frame movably mounted on a support and to which the brush is rigidly connected, an engaging part rigidly connected to the support and associated with said frame, a Ushaped spring fixed at one end to the frame and passing around a holding part on the engaging part, the other end of said spring loosely engaging the engaging part, and a flexible electrical connection between the engaging part and the brush.

3. A brush-holder, comprising a frame movably mounted on asupport and to which the brush is rigidly connected, an enga ing part rigidly connected to the support an associated with said frame, a U-shaped spring fixed at one end to the frame and passing around a holding part on the engaging part, the other end of said spring loosely engaging the engaging part, a flexible electrical connection between the engaging part and the brush, and an insulating-piece connected with said frame, so as to limit the movement of the frame toward the'commutator when the brush becomes worn a predetermined amount.

4. A brusl1-holder comprising a frame to which the brush is rigidly connected, a stud upon which said frame is movably mounted, an engaging part rigidly connected with said stud, a spring interposed between the engaging part and the frame, a flexible connection between said engaging part and the brush and a protecting device mountedupon said frame for preventing the frame from engaging the commutator. I

5. A brush-supporting device comprising a brush-carrying frame formed with two side pieces spaced apart, a stud upon which said frame .is movably mounted, an engaging member rigidly connected to said stud and formed with the projecting part extending between the side pieces of the frame, and a U-shaped spring', one endof said spring engaging the projecting part of said member and the other'end of said spring engaging the frame while the body of said s ring is located between the side pieces of sai frame.

6. A brush-holder comprising a brushcarrying frame movably mounted on a support, a member rigidly connected to the support and provided with a holding part and a U- shaped spring looped around the holding part 'of the member, one end of said spring engaging said member and the other end of said spring engaging said frame.

7. In a brush-supportin device, a stud, a

brush-carrying frame loose y mounted thereon, a member rigidly secured to the stud and extendin between the arms of-the frame, and an e ongated U-shaped spring also located between the arms of the frame with one end engagin the frame and the other end engaging said member.

8. In-combination, a movable frame adapted to carry a brush at one of its ends, a fixed member located between the arms of said frame, and a U-shaped spring the legs of which extend substantially parallel to and between the arms of said frame, one end of said spring engaging said member and the other end of said spring engaging said frames 9. In a brush-supportin evice, a stud, a brush-carrying frame loosely mounted thereon, a member rigidly secured to the stud and extending between the arms of the frame, and an elongated U-shaped s ring located between, and with its legs para el to, the arms of the frame with its bowed portion adjacent the stud and with one end engaging the frame and the other end en aging said member.

10. In a brush-hoIder, a movable brush-' carrying frame, means for pressing said frame toward the commutator and a protective device carried by said frame in position to limit the movement of said frame toward said commutator by reason of the engagement of the device with the commutator.

1 1. In a brush-supporting device, a stud, a brush-carrying frame comprising two arms the ends of which are loosely mounted on said stud, 'a member rigidly secured to the stud and extending between thearms of the frame, and an elongated U-shaped .s ring also located between the arms of the ame' wit one end engaging the frame and the other end engaging said member, the yoke of said spring being adjacent the stud and the ends adjacent to the brush.

12'. In a brush-holder, a metallic frame,

and anon-metallic protective device carried thereby in a position to prevent engagement between the frame and the commutator by reason of its interposition between them.

13. In a brush-hold ng a movable metallic brush-carrying frame and a non-metallic pro- III) tecting device carried by the frame in position to engage the commutator to prevent the frame from cominginto eontact'with the commutator.

14. In a brush-holder, the combination with a, pivot-shaft, of a brush-supporting f the commutator-with th metallic brushframe pivoted thereto; a brushflrigidly seframep cured. to said frame; spring means engaging .u JOHN P. MALLETT Said frame toqiloid 'the brush a alnst the 5 comnnitzztor with wbichjthe brusi-holder is f THOWAS BO 5 assoclateci, and a block of insulating fi11ate- Witnesses:

rial for engaging the commutator its the A J, BiIENZLI, ,b rush wearsdown "to prevent engagement F. M. CONLEE. 

